JP2770761B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a structure of a spindle pin formed at an upper end of a spindle for applying a driving force to an orbiting scroll.

[0002]

2. Description of the Related Art Conventionally, as a scroll compressor used for an air conditioner or a refrigerator, for example, JP-A-63-800 is known.
One disclosed in, for example, Japanese Patent Publication No. 88 is known. FIG.
FIG. 9 is a sectional view showing the conventional scroll compressor, FIG. 9 is an exploded perspective view of a spindle pin formed on a spindle and a slider fitted and mounted on the spindle in the conventional scroll compressor shown in FIG. FIG. 4 is a top view of a spindle pin portion on which a slider is mounted.

In FIGS. 8 to 10, (1)
Is a fixed scroll, (2) is an orbiting scroll, (2a) is a bearing formed at the center of the thrust surface on the anti-compression chamber side of the orbiting scroll (2), and (3) is a thrust surface (2b) of the orbiting scroll (2). )
The main frame supporting the thrust bearings (3a), (4)
Is an Oldham ring that prevents rotation of the orbiting scroll (2) during rotation, and (5) is a rotatable upper part supported by the main bearing (3b) of the main frame (3) and provides a driving force to the orbiting scroll (2). The transmitting spindle, (6) is at the upper end of this spindle (5),
(5) the main shaft pin portion formed so as to have a center O ₁ in a position eccentric with respect to the rotation center O of, (7) the spindle pin portion
6 shows cylindrical sliders mounted on (6) and rotatably fitted in bearings (2a) of the orbiting scroll (2).

Further, (8) is a motor stator (8a) and a spindle.
(5) A motor consisting of an electric motor rotor (8b) shrink-fitted and fixed to (5), and (9) an auxiliary bearing (9) rotatably supporting the lower part of the main shaft (5).
(10) is a shell, (11) is a suction pipe for guiding refrigerant from the outside into the compression chamber, (12) is a discharge pipe, and (13) is lubrication stored at the bottom of the shell (10). Oil, (14) is lubricating oil (1
An oil hole formed inside the main shaft (5) for sending 3) to each sliding portion, (15) indicates an upper balance weight, and (16) indicates a lower balance weight.

As shown in FIG. 10, the spindle pin 6 is based on a columnar shape centered on a position O ₁ eccentric with respect to the center O of the spindle 5, and has a diameter passing through the center point O _1. the flat surface portion on both sides of a position sandwiching the center point O ₁ in the direction along the direction of the line (17) is formed. On the other hand, a slider (7) fitted to the spindle pin (6) and rotatably mounted on the bearing (2a) of the orbiting scroll (2) has an elongated hole fitted to the spindle pin (6). 7a is formed in a ring shape.
Is formed so that its length in the longitudinal direction is larger than the diameter of the spindle pin portion (6). As a result, the slider (7) has flat surfaces (1) on both sides or one side of the spindle pin (6).
Slide 7) as a sliding guide surface in the direction indicated by the arrow in FIG. When fitting the slider (7) to the spindle pin (6), the slider (7)
It is seated on a seating surface (18) formed at the base of (6). In FIG. 10, O ₂ is a spindle pin portion during rotation of the spindle (5).
The center of revolution of the slider (7) swiveled by (6) is shown.

Next, the operation of the conventional scroll compressor will be briefly described. The rotation force of the motor (8) is controlled by the slider (5) from the main shaft (5) fixed to the motor
It is transmitted to the orbiting scroll (2) via (7). The orbiting scroll (2) performs an orbiting motion that moves in a circular orbit by the Oldham ring (4) that is a rotation prevention mechanism, and the fixed scroll (1)
The compression of the refrigerant is performed in accordance with a change in the volume of the compression chamber formed between the pressure and the pressure.

[0007] The refrigerant flows from the suction pipe (11) into the shell (10), which is a closed container, is compressed in the compression chamber, becomes high pressure, and flows out from the discharge pipe (12). At this time, the lubricating oil stored at the bottom of the shell (10) passes through the oil hole (14) due to centrifugal force or the like accompanying the rotation of the main shaft (5), and the upper surface of the main shaft (5)
An opening (14a) formed at the rotation center position of the above is guided to each bearing portion, a sliding portion and the like to perform a lubricating action.

[0008] As for the method of machining the spindle pin (6), usually, the spindle (5) and a cylindrical spindle pin (6) eccentric with respect to the center of the spindle are first machined and then formed. The flat surface portion (17) of the pin portion (6) is processed. At this time, it is very difficult to cut down the flat surface portion (17) so that the lower edge of the flat surface portion (17) is formed in the same plane as the upper surface 5a of the main shaft (5). When the flat surface (17) is machined from the basic cylindrical shape of
At a position slightly higher than a), a semilunar flat surface remains on the foundation of the spindle pin (6). For this reason, the flat portion is used as a slider seating surface (18), and the slider (7) is mounted thereon to maintain the posture of the slider (7).

[0009]

Since the conventional scroll compressor was constructed as described above, the main shaft (5)
When the diameter of the spindle is small, the spindle pin (6) also becomes small, and in order to stabilize the attitude of the slider (7), the flat surface section (17) is used to widen the slider seating surface (18).
If an attempt is made to form a central point O ₁ side of the (6), the one flat surface section (17) approaches the oil holes (14), a flat surface section oil holes (14)
The thickness between (17) and (17) becomes thin, causing a problem in strength.
Therefore, the total area of the oil hole (14) side of the flat surface portion (17) was formed and the other flat surface portion (17) and even more central point O ₁ closer away from the center point O ₁ slider seating surface (18) However, in this case, the area of one slider seating surface (18) becomes extremely small, and there is a problem that it is difficult to stabilize the posture of the slider (7).

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and maintains a strength of a spindle pin formed on an upper portion of a spindle and a slider mounted on the spindle pin. It is an object of the present invention to provide a scroll compressor in which a slider seating surface is formed as wide as possible to maintain the posture of the scroll compressor.

[0011]

According to the scroll compressor of the present invention, the opening of the lubricating oil hole is formed at the center of rotation of the main shaft on the upper surface of the main shaft pin, and the flat surface of the main shaft pin is defined as the center of the main shaft. A cutting part plane of a columnar part which is formed at a position parallel to and equidistant from the line connecting the center of the spindle pin part and which remains at the base when a flat surface part is formed on a columnar part serving as a basis of the spindle pin part Is a slider seating surface.

Further, the main shaft pin portion is formed by cutting off each side of the basic plane shape defined by at least two circular arcs having different centers, where the two circular arcs intersect, and forming the flat surface portion. The present invention is characterized in that a remaining flat portion excluding the main shaft pin portion from the columnar portion of the basic flat shape is formed at the base of the main shaft pin portion, and this flat portion is used as a seating surface of the slider.

[0013]

According to the scroll compressor of the present invention, the flat surface of the spindle pin is parallel to and parallel to the line connecting the center of the spindle and the center of the spindle in the columnar portion which forms the basis of the spindle pin. Since the oil holes are formed at equidistant positions, the openings of the oil holes formed on the upper surface of the main shaft pin portion at the center position of the main shaft are located on the bisector between the flat surface portions. Therefore, even if the flat surface portion is formed near the center of the spindle pin portion so that the slider seating surface is widened, a sufficient distance from the opening of the oil hole can be secured.

Further, by forming the flat surface portion of the main shaft pin portion from a rugby ball-shaped columnar portion defined by two arcs at different center positions having different basic plane shapes, the slider seating surface can be further widened. Can be secured.

[0015]

【Example】

Embodiment 1 FIG. Hereinafter, a scroll compressor according to the present invention will be described in more detail with reference to an embodiment shown in the drawings. FIG. 1 shows a main part, that is, a main shaft of a scroll compressor according to an embodiment of the present invention.
A spindle pin portion (20) formed on the upper part of (5) and a slider (7) fitted and mounted on the spindle pin portion (20) are shown. As shown in FIG. 3, the spindle pin portion (20) has an opening (1) of an oil hole (14).
Cylindrical portion centered the position O ₁ eccentric to the rotation center O of the spindle (5) which 4a) is formed (21) as a basis, the two center O from the cylindrical portion (21), O and it is configured to form a flat surface section (22) as a sliding guide surface of the slider (7) equidistant from the line across the center point O ₁ and parallel to the line connecting the _1.

On the other hand, the base of the spindle pin portion (20)
At a position slightly higher than the upper surface (5a) of (5), a seating surface (23) for seating the slider (7) is formed as shown in FIG. This seating surface (23) is the same as the conventional
When the flat surface portion (22) is formed on the cylindrical portion (21) (FIG. 3) which is the basis of the above, the cut portion plane of the cylindrical portion (21) remaining on the base has a semilunar shape. The slider (7) is the same as the conventional one, and is fitted to the spindle pin (20) and seated on the seating surface (23) so as to be slidable in the radial direction.

Next, the operation of the scroll compressor according to the present embodiment having such a spindle pin portion (20) will be described. However, the compression action and the flow of the lubricating oil in the scroll compressor are the same as those of the conventional scroll compressor, and the description thereof is omitted.

According to the scroll compressor of this embodiment,
Spindle pin flat surface portion (22) of (20), the main shaft (5) located equidistant A / 2 and from the line parallel to the line connecting the center O ₁ of the center O and the main shaft pin (20) of Oil hole formed in the upper surface of the spindle pin (20) at the position of the center O of the spindle (5)
The opening (14a) of (14) is located on the bisector between the flat surface portions (21). Therefore, the slider seating surface (23)
Adjust the position of the flat surface (22) so that the
Even if it is closer to the center of (20), the distance from the opening (14a) of the oil hole (14) can be sufficiently taken, and the slider (7) slides in a stable posture by the wide seating surface (23).

As a result, according to the scroll compressor of this embodiment, the rigidity of the spindle pin portion (20) is not reduced.
Moreover, since the slider seating surface (23) can be made relatively wide, problems such as seizure of the slider bearing due to poor posture maintenance of the slider can be avoided. In addition, even when the slider moves in the sliding direction, if the seating surfaces are symmetrical, the frictional force is equal, and the force in the rotating direction does not act.

Embodiment 2 FIG. FIG. 4 shows a main part of a scroll compressor according to another embodiment of the present invention, that is, a main shaft pin part (30) formed on an upper part of a main shaft (5) and a slider (7) fitted and mounted thereto. It is shown. As shown in FIG. 5, the main shaft pin portion (30) of the scroll compressor in this embodiment is positioned differently while being centered on a radial line passing through the rotation center O of the main shaft (5). Two arcs (31
a), of the columnar portion (31) having a rugby ball-shaped basic plane shape defined by (31b), cut off each side of these two arcs in parallel with the above-mentioned center line. It is configured by forming a flat surface portion (32) (FIGS. 6 and 7).

On the other hand, the seating surface (3) on which the slider (7) sits
3) is a cutting portion of the columnar portion remaining on the base when the flat portion (32) is formed on the columnar portion (31) which is the basis of the spindle pin portion (30) at the base of the spindle pin portion (30). It becomes a plane. in this way,
Two circular arcs (31a), (31
If the main shaft pin portion (30) is formed from the rugby ball-shaped column portion (31) partitioned by b), the slider seating surface
(33) can be secured more widely than that of the embodiment shown in FIG. 1, the stable maintenance of the slider (7) and the rigidity of the spindle pin (30) are compatible, and the reliability of the scroll compressor is improved. Performance can be improved.

[0022]

As described above, according to the scroll compressor of the present invention, the flat surface portion acting as the slider sliding guide surface in the spindle pin portion formed on the upper portion of the spindle is formed by the rotation center of the spindle and the spindle pin portion. A sufficiently wide slider without reducing the rigidity of the main shaft pin portion by being formed on the columnar portion at a position parallel to and equidistant from the line connecting the center of the upper surface portion of the columnar portion as the basis of the main portion. A seating surface can be ensured, whereby a stable posture of the slider can be maintained, and seizure of the slider bearing can be avoided.

Further, by forming the flat surface portion of the main shaft pin portion from a columnar portion defined by two arcs at different center positions having different basic plane shapes, the slider seating surface can be further widened. This allows the slider to be maintained in a more stable posture.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a spindle pin portion according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing an upper portion of a spindle before forming a spindle pin portion shown in FIG. 2;

FIG. 4 is a plan view showing a main part main shaft pin portion and a slider mounted thereon according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing an upper portion of the spindle before forming the spindle pin portion shown in FIG. 4;

FIG. 6 is a perspective view of a spindle pin shown in FIG. 4;

FIG. 7 is a plan view of the spindle pin shown in FIG. 6;

FIG. 8 is a longitudinal sectional view showing a conventional scroll compressor.

FIG. 9 is an exploded perspective view showing a main shaft pin portion and a slider mounted on the main shaft pin portion in the conventional scroll compressor shown in FIG.

FIG. 10 is a plan view showing a conventional spindle pin portion and a slider shown in FIG. 9;

[Explanation of symbols]

Reference Signs List 1 fixed scroll, 2 orbiting scroll, 3b bearing, 4 Oldham ring, 5 main shaft, 5a upper surface, 7
Slider, 7a long hole, 8 motor, 14 oil hole, 1
4a Opening, 20 spindle pin, 21 cylinder, 22
Flat surface, 23 slider seating surface.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-164588 (JP, A) JP-A-59-173587 (JP, A) JP-A-2-176179 (JP, A) JP-A-63-163 80088 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18/02

Claims (2)

(57) [Claims] 1. A fixed scroll, an orbiting scroll cooperating therewith to form a compression chamber, a bearing formed at the center of the orbiting scroll on the side opposite to the compression chamber, and a driving force transmitted to the orbiting scroll. A spindle formed at an upper portion of the spindle and eccentric with respect to the rotation center of the spindle, the spindle pin being fitted into the bearing of the orbiting scroll; An opening of a lubricating oil hole formed at the center of rotation of the main shaft on the upper surface of the main shaft, flat surface portions formed on both sides of the center of the main shaft pin, and the orbiting scroll mounted on the main shaft pin and A cylindrical slider rotatably arranged in the bearing, and a seating surface formed on the spindle pin portion at the base of the spindle pin portion to seat the slider,
The flat surface portion of the spindle pin portion is formed at a position parallel to and equidistant from a line connecting the center of the spindle and the center of the spindle pin portion, and the slider seating surface is formed on the base of the spindle pin portion. A scroll compressor characterized by being formed by a cut portion plane of a columnar portion remaining on a base portion when the flat surface portion is formed on the columnar portion. 2. A basic planar shape in which the spindle pin portion is defined by at least two arcs having different centers.
The flat surface portion is formed by cutting off each side where two arcs intersect with each other, and the remaining flat portion excluding the main shaft pin portion from the columnar portion of the basic plane shape is formed at the base of the main shaft pin portion, The scroll compressor according to claim 1, wherein the flat portion is a seating surface of the slider.